Spark-arrester.



N0 IODEL.

PATENTED MAY 10, 1904.

G. H. R0011.

SPARK ARRESTER.

nruouxon nun 00121, 1902.-

III

IH g

UNITED STATES ZPatented May 10, 1904.

PATENT OFFICE.

SPARK-ARRESTER.

SPECIFICATION forming" part of Letters Patent No. 759,553, dated May 10, 1904.

Application filed October 7, 1902- -T at whom it may concern:

Be it known that I, GRENVILLE H. Roon, a citizen of the United States, residing at W ashlngton, District of Columbia, have invented a new and useful Spark-Arrester, of which the following is a specification.

This invention relates to spark-arresters,

e and has for its object to provide an improved device of this character which is complete in itself and in the nature of anattachment for application to the top of the stack of a traction-engine, locomotive, and the like without requiring any change or alteration whatsoever in the stack.

cape of the smoke and gases, while at the same time to effectually prevent the escape of live sparks and to direct the same back into the of the invention.

In the drawings, Figure 1 is a vertical longitudinal sectional view of a spark-arrester constructed and arranged in accordance with the present invention. Fig. 2 is a top plan View thereof.

Like characters of reference designate corresponding parts in both the figures of the drawings.

The present device embodies an inverted truncated conical head 1, which is preferably formed of sheet metal and open at the top and bottom, with a sheet-metal tubular neck portion 2 pendent from the lower open end of the head, with its upper end open to communicate with the head and its lower end open, so as to be telescopically fitted upon the top of a stack. (Not shown.)

WVithin the upper portion of the head is an It is furthermore designed to arrange the device so as not to interfere to any material extent with the exhaust and the es Serial No. 126,835. (No modelf).

annular downwardly and inwardly inclined flange 3, the upper edge of which is folded over and riveted to the upper peripheral edge of the head, as indicated at 4, so as to form a tight joint between the head and the flange, the latter forming an imperforate inverted truncated conical hood the central opening of which forms a flue for the escape of the exhaust, smoke, See;

Belowthe hood is an inverted hollow conical deflector 5,-the lower end of which lies in or above the plane of the connection between the neck 2 and the head 1, with its side walls parallel with the inclined side walls of the head. The upper open end of the deflector rises abovcand embraces the lower-end of the hood 3, whereby said ends overlap, the diameter of the upper end of the deflector being greater "than the diameter of the lower end of the hood, whereby the latter overhangs and forms a top for the annular space between the deflector and the head, and there is an annular interspaee between the upper end of the defiector and the lower end of the hood, through which the exhaust, smoke, and the like may escape to the opening in the hood and thence outwardly through the top of the device. For the support of the deflector there is a plurality of hanger-brackets 6, which have upper terminal laterally-directed ears 7, which are riveted or otherwise secured to the lower side of the hood, and are also provided with lower terminal ears 8, which are similarly fastened to the inner side of the deflector, whereby the latter is suspended solely from the hood and there are no obstructions in the annular space between the deflector and the head.

The inclined sides of the lower conical deflector 5 form practically eontinuations of the inclined sides of the upper truncated hood, and the inclined sides of head 1 extend downward from the top of the hood to the stack. By this construction the einders pass upward along the sides of the deflector and the hood and are returned to the stack by the inclined sides of the head to be again thrown upward. This operation will result in breaking up or powdering large cinders, which will be prevented from escaping with the smoke and gases; but the dust resulting from this breaking up of large cinders will pass out of the stack with thegases.

When the present form of spark-arrester is in use, the exhaust, smoke, live sparks, &c., rising through the stack strike the lower end of the deflector and are thereby directed radially outward and upward close to the sides of the deflector, as indicated by the arrows A. The sparks will strike against the hood 3 and thereby be deflected laterally outward at points above the top of the deflector, while the smoke, gases, &c., pass over the top of the deflector across the bottom of the hood and thence upwardly through the central opening thereof. The space above the deflector and between the hood and the head is long, narrow, and tapering and is substantially free from currents and is therefore a dead-air space, wherefore the sparks after being deflected outwardly by the hood fall downwardly adjacent to the sides of the head, as indicated by the arrows B, and finally pass down through the neck of the device and the stack to the smoke-box.

That which makes the present device particularly effective in preventing the escape of live sparks is the fact that the lower end of the hood 3 dips down into the open top of the deflector 5 and below the upper peripheral edge thereof and extends outwardly to the upper peripheral edge of the head, thereby covering the top of the annular space between the deflector and the head and lying across the path of the ascending sparks, whereby the latter will be deflected outwardly and upwardly, and the smoke, gases, &c., are free to pass laterally inward across the top of the deflector and thence outwardly through the central opening in the hood. Furthermore, the deflector is hung from the hood by means of hangers or brackets located within the deflector, and hence the annular space between the latter and the head is unobstructed. Still further, the device is complete in itself, there are no movable or adjustable parts, and all of the parts are positively and rigidly connected, whereby the device may be readily applied and removed without requiring any adjustment of the parts and without necessitating any change or alteration in the stack.

WVhat is claimed is A spark-arrester, comprising a hollow inverted truncated hood having inclined sides, a conical deflector arranged below the hood and having inclined sides forming practically continuations of the sides of the hood, the adjacent portions of the hood and the deflector being spaced apart to provide an outlet, and a hollow inverted truncated head united with the hood and having inclined sides extending downward from the top of the same to the stack to return cinders to the latter, whereby the cinders will be again thrown upward, and thereby powdered or ground into dust, substantially as described.

In testimony that I claim the foregoing as my own I have hereto affixed my signature in the presence of two witnesses.

GRENVILLE H. ROOD.

Witnesses:

JOHN H. SIGGERS, S. GEORGE TATE. 

